Linux Kernel Deadlock Vulnerability in AMD DNA Acceleration Driver During Suspend and Resume

A deadlock vulnerability has been identified in the Linux kernel's AMD DNA acceleration driver, specifically in the power management routine. This issue arises when an application sends a query IOCTL while the auto-suspend feature is active. The query process acquires the device lock and then calls a function to resume power management, which waits for the current suspend operation to finish. Meanwhile, the suspend callback tries to acquire the device lock, leading to a deadlock situation. The vulnerability affects the Linux kernel stable tree.

Impact

Exploitation of this vulnerability leads to a deadlock condition, causing the system to hang and potentially disrupting normal operations.

Reproduction

To reproduce this vulnerability, initiate an auto-suspend process and then issue a query IOCTL within the same timeframe. The query will hold the device lock and attempt to resume power management, while the suspend callback tries to acquire the lock, creating a deadlock.

Remediation

The vulnerability has been addressed in the Linux kernel. Users can apply the latest patches available in the Linux kernel stable tree to mitigate this issue.